TY - JOUR
T1 - Ceramic coating on Ti-6Al-4V by plasma electrolytic oxidation in molten salt
T2 - Development and characterization
AU - Sobolev, Alexander
AU - Zinigrad, Michael
AU - Borodianskiy, Konstantin
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/2/25
Y1 - 2021/2/25
N2 - The plasma electrolytic oxidation (PEO) method is one of the most promising methods for the formation of oxide coatings on metallic substrates. This process is usually conducted in an aqueous solution electrolyte; however, it has several disadvantages, such as heating-up of the system and the formation of the undesired chemical components. This study addresses these disadvantages by conducting the process in a molten salt electrolyte. The surface morphology, phase composition, hydrophobicity, and the effects of process current frequency were examined. Thin titanium oxide, rutile and anatase, coating of 2–2.5 μm was formed on the treated Ti-6Al-4V alloys. The potentiodynamic polarization test evaluated the highest polarization polarization resistance for the alloy obtained using current frequency of 150 Hz which was 364×104 Ω·cm2 in comparison with the pristine alloy which was 6.93×104 Ω·cm2. Electrochemical impedance spectroscopy revealed the same behavior. Morphology evaluation revealed that the structure of this coating contained uniform sub-micron porosity and its surface exhibited the highest hydrophobicity.
AB - The plasma electrolytic oxidation (PEO) method is one of the most promising methods for the formation of oxide coatings on metallic substrates. This process is usually conducted in an aqueous solution electrolyte; however, it has several disadvantages, such as heating-up of the system and the formation of the undesired chemical components. This study addresses these disadvantages by conducting the process in a molten salt electrolyte. The surface morphology, phase composition, hydrophobicity, and the effects of process current frequency were examined. Thin titanium oxide, rutile and anatase, coating of 2–2.5 μm was formed on the treated Ti-6Al-4V alloys. The potentiodynamic polarization test evaluated the highest polarization polarization resistance for the alloy obtained using current frequency of 150 Hz which was 364×104 Ω·cm2 in comparison with the pristine alloy which was 6.93×104 Ω·cm2. Electrochemical impedance spectroscopy revealed the same behavior. Morphology evaluation revealed that the structure of this coating contained uniform sub-micron porosity and its surface exhibited the highest hydrophobicity.
KW - Molten salt
KW - Morphology
KW - Plasma electrolytic oxidation
KW - Titanium alloy
UR - http://www.scopus.com/inward/record.url?scp=85100181399&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2021.126847
DO - 10.1016/j.surfcoat.2021.126847
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AN - SCOPUS:85100181399
SN - 0257-8972
VL - 408
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 126847
ER -